Thanks for advice here, I hosed down my black water tank with city water hooked up on the sani con panel. After one rinse, the black water tank now reads empty instead of 1/3 full when it's empty. Thank you.

On the sani con panel there is also a button for the coach water pump. I assume if I open the rinse valve and hit this pump button, I'll flush the tanks with onboard water? Thanks, Mark

The tanks can only be flushed when an outside water source is connected to the SaniCon panel. The pump switch just turns the onboard water pump on or off. The new models have three switches (kitchen,bath and Sani Con).

i believe that the switch in the sani-con compartment is for turning on and off the water pump when you want to use the outside shower. That way when you are outside and don't want to run inside just to turn on the water. Great when dry camping at the beach.

I have some more questions on the use of the Sani-con system, too. So, I'm tagging them on here. (Please forgive me for bothering you with such trivial matters.)

First a long description:I alway dump the black tank with the Sani-con system and follow the recommended procedure of tank equalization and draining the black tank to try to keep it clean and flushed out. I alway add Thetford Aqua-Kem and about a gallon of water when I know the tank is empty. But, after every dump is complete, the indicator lights inside says that the black tank is 2/3 full. I then flush the black tank with my flush water hose until I can see that the water coming out of the tank looks clear. Now, the indicator light says the black tank is empty. I didn't expect to need to do the extra flush after every black dump.

Questions:Is the Aqua-Kem inadequate to enable a clean flush? Should I use a different product? Should I just do as I'm doing and be happy to have the Sani-con instead of just the old messy 3" system?

Another long description: When we're in the same RV park location for more than a few days, I've been using the 3" dump valve to drain the gray tank every day if the dump station is near the rear of the coach and I can connect with a short 3" type hose. I leave the 3" drain tube connected, so it is a quick task to open the gray valve in the sani-con compartment and the 3" valve at the back end, then reverse the process after the gray tank is empty. I use the 3" drain for this because I'm reluctant to leave the Sani-con hose laying out on the ground and it often doesn't stay screwed into the dump as the 3" hose does.

Now for a couple of questions:1. I've been closing the Sani-con gray valve every day rather than leave it open and let the little "open" light stay on. I hate the thought of that light burning out and have to replace it. Am I being too cautious here? (I've read that some of you leave the valve open in a similar situation--any problem?)2. Maybe this question will help resolve the question above: I just noticed today that when I open the Sani-con gray tank with the Sani-con switch, the pull handle on the gray tank comes out automatically. Could I just pull that handle out manually and avoid the constant "light" issue, or would I break something?

PS: I know there is a gray tank overflow by-pass on the Sani-con that I could rely on, but then I'd still have the "open" light issue, right?

This is another one of those opinion items so I can only tell you what I do. First if I connect my 3" hose I always leave the gray tank open. I spoke with the manufacturer and that red light is an LED that will last for many hours. I leave my gray tank open for weeks at a time. Second, I will flush both the black and gray tanks until the water runs clear whenever possible. Lastly, toilet tissue used is also something to consider. We do the toilet paper test to determine what brand is best for us. Take two sheets of a brand of toilet paper and place them in a 16oz glass. Fill the glass about half way or so with water. Shake. See how fast it breaks up. We have found that angel soft is the best. Even better than the RV toilet paper they market

Bruce I previously had read Barry's post on TP, we now use the same. AS far as chemicals for the tank,,, we do stay too long in any one place 3/4 days at most. I only use Calgon water softener in the tank,,, I mix about 4oz gallon of water, pour about half into sinks,shower, rest into toilet. the tanks and pipes become very slippery.. it is suppose to coat the walls of the pipes and tanks where nothing sticks... I have no problem dumping smell... I usually sanitize the fresh tanks twice a year,,( we travel usually spring and fall) while doing this I also put some weak bleach mixture down all the pipes and toilet. flush everything, fill up the tanks water, add more calgon to the system and away we go.If you want I can find the actual posting on the Calgaon,,, was from some guy who had been RVing for 20+years.sparky